ISO 6609-1985 Aluminium ores Determination of iron content Titrimetric method《铝土矿石 铁含量的测定 滴定法》.pdf
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1、International Standard f 6609 0 Q 4 4igB INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEYHAPOHAR OPAHM3At V, is the volume, in millilitres, of standard potassium dichromate solution (4.8) used for titration of the analytical sample; Vs is the volume, in millilitres, of standard potassium dichromaf
2、e solution (4.8) used for titration in the blank test; m is the mass, in grams, of the test portion. 8.2 General treatment of results 8.2.1 Precision The precision of this method, as determined in an International test programme, is expressed in terms of repeatability, reproducibility and reproducib
3、ility index in the fable. Table - Precision data for iron determination Sample Components of Reprodu- standard deviation cibility index % hllml r 1 R 2s MT/1213 5,63 O,N O,C 0,20 MT/1211 17,41 0,14 0,14 0,39 MT/1215 19,50 609 0.12 0,30 MT/ 1212 43.30 0,13 0,12 0,35 where r is the repeatability; R is
4、 the reproducibility. 8.2.2 Acceptance of analytical values (see IS0 57251 The analytical value for the test sample shall be accepted when the analytical value obtained for the corresponding certified reference material agrees with the certified value within the limit of the reproducibility index co
5、ntained in the table, and when the difference between the two values for the test sample does not exceed 2,77 r, as calculated from the appropriate value of r given in the table. When the analytical value obtained for the certified reference material is outside the reproducibility index, an analysis
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